
<template>
  <div class="login_container">
    <div class="login-box">
        <!--头像-->
      <div class="advatar">
        <img src="../assets/logo.png" alt />
      </div>
<!--用户登录表单-->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login-form">
        <!--用户名-->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username"  prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!--密码-->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password"  prefix-icon="iconfont icon-3702mima" show-password></el-input>
        </el-form-item>
        <!--按钮组-->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      loginForm: {
        username: "admin",
        password: "123456"
      },
      //表单校验规则
      loginFormRules:{
          username:[
                { required: true, message: '请输入登录名称', trigger: 'blur' },
                { min: 3, max: 6, message: '长度在 3 到 6 个字符', trigger: 'blur' }
          ],
          password:[
               { required: true, message: '请输入登录密码', trigger: 'blur' },
                { min: 6, max: 15, message: '长度在6到15个字符', trigger: 'blur' }
          ]
      }
    };
  },
  methods: {
      //表单重置 （熟练掌握ref, 至于button能够绑定resetLoginForm事件，因为内部封装了$listener方法）
      resetLoginForm(){
          this.$refs.loginFormRef.resetFields();
      },
      //在发送请求之前对登录进行预校验 if true才能发送ajax
      login(){
          this.$refs.loginFormRef.validate( async v=>{
              if(v) {
                //await只能修饰promise对象！！！ 只能和async搭配使用
                const {data:res}= await this.$http.post('login',this.loginForm);
           
                if(res.meta.status==200) {
                    this.$message.success('登录成功');
                    window.sessionStorage.setItem('token',res.data.token);
                    this.$router.push('/home');
                } else {
                    this.$message.error('登录失败')
                }
              } else{
                  this.$refs.loginFormRef.resetFields();
              }
          })
      }
  },
};
</script>
<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login-box {
  background-color: #fff;
  width: 450px;
  height: 300px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 5px;
  .advatar {
    width: 130px;
    height: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}
.login-form {
  position: absolute;
  bottom: 0;
  width: 100%;
  box-sizing: border-box;
  padding: 0 20px;
}
.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
